Max fbenz



March 18 1924. 1,487,157

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- M. FRENZ CALCULATING MACHINE Filed Oct 27, 1922 2 sheen-sheet 2 Patented Mar. 18, 1924.

PATENT OFFICE.

MAX FRENZ, OF LICHTENBERG-NEAR-BERLIN, GERMANY.

CALCULATING MACHINE.

Application flledoctober 27, 1922. Serial No. 597,885.

To all whom it may concern:

Be it known that I, MAX FRENZ, a citizen of the German Republic, and resident of 10 Boklin Str., Lichtenberg-near-Berlin, Germany, have invented certain new and useful Im rovements in Calculating Machines, of whlch the following is a specification.

This invention relates to calculating machines, particularly to that class known as the Thomas calculator and it concerns more especially the displacing mechanism for the platen thereof. In connection with these machines it isknown, that the platen carrying the calculating mechanism must be shifted to either the right or left hand side after having been swung upwardly about a hinge member provided on the frame of the machine; said shifting being necessary as to whether the machine is to be used for multiplication or for division, and it has already been proposed to effect such shifting by the employment of special controlling means, such as control levers, which are operated for example by key barsprojecting through the frame.

The main object of the invention, now, is to provide a device of the aforesaid kind in which the means for shifting the calculating mechanism shall be greatly simplified, and which shall be handy and effective in use.

With these and other objects in view the invention may be broadly described as consisting in the provision of a main lever, arranged to swing at right angles to the platen carrying the calculating mechanism, and 0 an auxiliary lever carried by the former and adapted to swing in unison with the same. The said auxiliary leveris resiliently connected to the main lever and it has two laterally projecting pins adapted to engage with the arms of two levers which are pivoted on a pin in the machine frame and which are extended through the frame, so that by their depression the platen of the calculating mechanism is accordingly shifted either to the right or to'the left.

The accompanyin drawing illustrates the invention by way 0% example.

Fig. 1 shows the arrangement according to the invention in side elevation within the machine casing, the latter being shown in section.

f in the Fig. 1" is a view similar to Fig. 1 with the operating levers in a different position,

Fig. 2 is a front view of the device according to the invention,

Fig. 3 is a side view thereof,

Fig. 4 is a plan view of the same,

Fi 5 is a detail showing the recessed shifting bar in part sectional front elevation,

Fig. 6 is a lower plan view of the platen carrying the calculating mechanism.

Referring to Fig. 1 in particular; 1 is the casing or frame of the calculating machine in which a lever 2 is arranged to rock about a pivot 1. The said lever carries parallel to it a rod 8 pivoted in pins 4 and 5, which latter are provided in the overlapping ends of lever 2. The said rod 3 is acted upon at both side by leaf springs 6 which are fixed to the lever 2 by means of screws 7 (Figs.

2 and 3) so that the rod 3 will only be able to turn after overcoming the resistance of the said springs. Below the point of application of the said springs 6 the rod is further provided with pins 8 extending freely to both sides of the said rod whereas, at its upper end, it has a set-off arm 9 which carries at its free end an adjustable pointer 10. The position of this pointer is about direotly'below the front edge of the platen 12, which latter is hinged at 11 to the chine frame, and is provided with a threaded portion 13' by means of which it may be adjusted in relation to the said platen withhead of the arm 9. On the lever 2 being rocked about its pivot 1, the rod 3 is also rocked so as to lift the arm 9 which, in turn, causes the pointer 10 to rise and to engage with the recessed bar 13 on the lower surface of the platen 12, whereby the latter -is raised to bring the wheels of the calculating mechanism out of engagement with the wheels of the setting-out device. Pivoting of the lever 2 about its pin 1. takes place by means of pins 8, 8 extending laterally fromv the lower portion of rod 3. As will be seen. from Fig. 1, one end 14 of a two-arm lever which is pivoted at 15 is adapted to engage pin 8 by means of a recess, while the opposite end 16 of the said lever is off set at 17 (See Fig. 4.) In a similar manner the end 18 of another two-arm lever also pivoted at is adapted to engage pin 8, whereas its opposite end 19 is likewise off set as at 20. Both levers l6 and 19 are extended to project through the frame of the machine and are provided with keys 21 and respectively.

y depressing, for e:-;ample, the lever arm 16 the following will take place: First of all rod 3 is rocked toget ier with its supporting lever 2 about pin l so as to lift the platen 12 by means of the pointer 10. Continuing the depression of the arm 16 until after the rod 3 has encountered a fixed stop, that is, when the platen has been sulliciently lifted, the rod 3 begins to turn about its hinge pins i and 5 against the resistance of the springs 6. Arm 9 is hereby moved sideways and the pointer 10 caused to advance the calculating mechanism by the amount of one decade. li hen, instead. oi lever arm 16, the arm 1.9 is depressed, its arm 18 coming into contact with pin 8 will first of all again cause a pivotal movement of lever 2 and subsequently a partial rotation of the rod 3 about its hinge pins -iiand 5, but th movement, this time, will be in the opposite direction. Crossing the lever arms is: and 18 a the places marked 17 and 20 respectively serves the purpose of causing a displacement to the left when depressing the left hand side key 22 (Fig. tic), and to the right, when depressing the right hand side key 21. By this simple expedient an erroneous manipulation of the respective keys for multiplication or division is avoided.

In order to ensure that the pointer 10 will remain engaged with the bar 13 until cornpletion of the displacement of the platen, the said bar is provided with approximately dove tail shaped recesses 23 (Figs. 5 and ('5) and the pointer with a broadened chisel pointed head 2i which, when the pointer is raised, enters first into the extended ends of the dove tail shaped recesses and afterwards, during the lateral movement of the platen, into the narrower part of same, within which it is held until completion of the dis placement.

hat I claim is 1. In a calculati g machine the combination with a pivoted and slidable platen carrying the calculating inecluiuism, of a main rocking lever movable a t right angles to the said platen, an auxiliary rot ing lei er hingedly carried by the main rocking lever and adapted to pivot at right any so thereto, resilient means-to nor, prevent such pivotal movement, an. oil ivm to said auxiliary rocking l ver. a pen. er at the end of said arm to first lift and then shift the platen on the rocking levers being rocked, and means to rock both rooting levers from without.

2. In a calculating machine the combination with a pivoted and slid-able platen carrying the calculating mechanism, of a main rocking lever movable at right angles to the said platen, an auxiliary rocking lever hingedly carried by the said main rocking lever and adapted to pivot at right angles thereto, a spring at each side of the main rocking lever pressing against the auxiliary lever to normally prevent such pivotal movement, a pin projecting from each side of the auxiliary lever, an offset arm to the said lever, an adjustable pointer at the end of said arm to first lift and then shift the platen on the rocking levers being rocked, and two manually operated levers each coope 'ating with one of the said pins of the auxiliary rocking lever.

53. In a calculating machine the combination with a pivoted and slidable platen carrying the calculating mechanism, of a main rocking lever pivoted at its upper end to the machine frame and movable at right angles to the said platen, two lugs at either end of the said lever, an auxiliary rockin lever carried by the said main lever an hinged between the said lugs of same, a spring at each side of the main rocking lever pressing against the auxiliary lever to normally prevent pivotal movement of the latter, an offset arm to the auxiliary lever carrying an adjustable pointer at its end, a pin projecting from each side of the auxiliary lever, two manually operated levers crossing each other at'abouttheir centres, a recess in the head of each of said levers to co-operate with one of the pins projecting from the auxiliary lever so as to first rock both levers in unison and then cause the auxiliary lever to swing sideways to thereby lift and shift the platen by means of the said pointer.

4. In a calculating machine the combination with a pivoted and slidable platen carrying the calculating mechanism, of a main rocking lever pivoted at its upper end to the machine frame and movable at right angles to the said platen, two lugs at either end of the said lever, an auxiliary rocking lever carried by the said main lever and hinged between the said lugs of same, a spring at each side of the main lever pressing against the auxiliary lever to normally prevent pivotal movement of the latter, an o lset arm to the auxiliary lever carrying an :uljustable pointer at its end, a pin project ing from each side of he auxiliary lever, two manually operated levels crossing each other at about their centres, each co-operatwith one of the pins projecting from the auxiliary lever to first rock and then shift the platen to the left- When the left hand side lever is depressed and to the right when the right hand side lever is depressed.

5. In a calculating machine in combina tion, a pivoted and slidable platen carrying the calculating mechanism, a dove tail recessed bar at the lower side thereof, a main platen 0n the rocking levers being rocked, rocking lever, an auxiliary rocking lever and a broadened substantially chisel-shaped hingedly carried by the said main rocking head to the said pointer to engage into the 10 lever, an offset arm to the said auxiliary dove tail recesses of the platen.

5 lever adapted to swing at rifiht angles to In- Witness whereof I aflix my signature.

the main lever, a pointer at t e end of the said arm to first lift and then shift the MAX FRENZ. 

